DTC    C1247/47    Stroke Sensor Malfunction

DTC    C1346/71    Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC)

DTC    C1392/48    Stroke Sensor Zero Point Calibration Undone

for Preparation Click here


DESCRIPTION

The stroke sensor inputs the pedal stroke into the skid control ECU.
DTC C1346/71 can be deleted when the brake pedal stroke sensor sends a stroke sensor signal or the Test Mode ends. DTC C1346/71 is output only in the Test Mode.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C1247/47
171
Sensor power source voltage (VCSK) is 3.6 V or less or 4.95 V or more for at least 1.2 seconds.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
  3. Brake pedal stroke sensor power supply
  4. Skid control ECU
↑
172
Ratio of sensor output voltage 1 (SKS1) to sensor power source voltage (VCSK) is less than 3 % or 97 % or more for at least 1.2 seconds.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
↑
173
Ratio of sensor output voltage 2 (SKS2) to sensor power source voltage (VCSK) is less than 3 % or 97 % or more for at least 1.2 seconds.
↑
↑
174
The stroke value converted from the sensor output 1 (SKS1) fluctuates due to noise.
↑
↑
175
The stroke value converted from the sensor output 2 (SKS2) fluctuates due to noise.
↑
↑
176
Zero point stored value (ratio to power source voltage) of sensor output 1 (SKS1) is not between 0.15 and 2.3.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
  3. Sensor installation
↑
177
Zero point stored value (ratio to power source voltage) of sensor output 2 (SKS2) is not between 2.42 and 4.85.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
↑
179
Difference between sensor output 1 (SKS1) and sensor output 2 (SKS2) is excessively large for at least 0.2 sec.
↑
C1392/48
-
Zero point calibration of stroke sensor is unfinished.
  1. Brake pedal stroke sensor zero point calibration undone (initialization of linear solenoid valve and calibration undone)
  2. Skid control ECU

WIRING DIAGRAM


C109406E01


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU or brake pedal stroke sensor, perform initialization of linear solenoid valve and calibration (Click here).

1.CHECK BRAKE PEDAL

  1. Check that the brake pedal and the brake pedal stroke sensor are properly installed and that the pedal can be operated normally.

  1. Check the brake pedal height (Click here).

    OK:
    The brake pedal is securely installed.
    The pedal height is within the specified range.



NG
ADJUST BRAKE PEDAL
OK


2.READ VALUE OF INTELLIGENT TESTER (BRAKE PEDAL STROKE SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    Stroke Sensor
    		Stroke sensor /
    min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.7 to 1.3 V
    Stroke Sensor 2
    		Stroke sensor 2 /
    min.: 0 V, max.: 5 V
    		When brake pedal is released:
    3.7 to 4.3 V

  1. Read the pedal stroke sensor voltage value on the intelligent tester screen.

    OK:
    The normal condition value is displayed on the intelligent tester.



NG
ADJUST BRAKE PEDAL STROKE SENSOR
OK


3.PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION

  1. Perform initialization of the linear solenoid valve and calibration (Click here).


NEXT


4.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the engine switch on (IG).

  1. Check if the same DTCs are recorded (Click here).

    Result:

    Condition
    		Proceed To
    DTCs (C1247/47 and C1392/48) are not output
    		A
    DTCs (C1247/47 and C1392/48) are output
    		B



B
Go to step 5
A

END 

5.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO BRAKE PEDAL STROKE SENSOR)


    C110894E02

  1. Disconnect the skid control ECU connector and brake pedal stroke sensor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		Specified Condition
    A14-1 (SKS2) - A38-2 (SKS2)
    		Below 1 Ω
    A14-3 (SKS) - A38-4 (SKS1)
    		Below 1 Ω
    A14-4 (SKG) - A38-1 (SKG)
    		Below 1 Ω
    A14-5 (VCSK) - A38-3 (VCSK)
    		Below 1 Ω

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		Specified Condition
    A14-1 (SKS2) - Body ground
    		10 kΩ or higher
    A14-3 (SKS) - Body ground
    		10 kΩ or higher
    A14-4 (SKG) - Body ground
    		10 kΩ or higher
    A14-5 (VCSK) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT SKID CONTROL ECU (SENSOR INPUT VOLTAGE)


    C110895E02

  1. Reconnect the skid control ECU connector.

  1. Disconnect the brake pedal stroke sensor connector.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester Connection
    		Specified Condition
    A38-3 (VCSK) - A38-1 (SKG)
    		3.6 to 4.95 V



NG
REPLACE SKID CONTROL ECU
OK


7.READ VALUE OF INTELLIGENT TESTER (BRAKE PEDAL STROKE SENSOR)

  1. Connect the brake pedal effort gauge.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    Stroke Sensor
    		Stroke sensor /
    min.: 0 V, max.: 5 V
    		When brake pedal is released:
    0.7 to 1.3 V
    Stroke Sensor 2
    		Stroke sensor 2 /
    min.: 0 V, max.: 5 V
    		When brake pedal is released:
    3.7 to 4.3 V

  1. When depressing the brake pedal with amount of force listed in the table below, check that the output value displayed on the intelligent tester is normal.

    HINT:
    The brake pedal must be depressed gradually.


    Voltage:

    Brake effort
    (kgf, lbf)
    		Stroke Sensor
    (DATA LIST)
    		Stroke Sensor 2
    (DATA LIST)
    50 (5.1, 11)
    		1.4 to 1.8 V
    		3.2 to 3.6 V
    100 (10.2, 22)
    		1.55 to 1.95 V
    		3.05 to 3.45 V
    150 (15.3, 34)
    		1.65 to 2.05 V
    		2.95 to 3.35 V
    200 (20.4, 45)
    		1.7 to 2.1 V
    		2.9 to 3.3 V



NG
REPLACE BRAKE PEDAL STROKE SENSOR
OK


8.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Perform the road and braking test.

  1. Check if the same DTCs are recorded (Click here).

    HINT:
    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.


    Result:

    Condition
    		Proceed To
    DTCs (C1247/47 and C1392/48) are not output
    		A
    DTCs (C1247/47 and C1392/48) are output
    		B



B
REPLACE SKID CONTROL ECU
A

END